package per.qiao.simplerest.proxy;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

import java.lang.reflect.Field;

public class AopTargetUtils {
     /** 
     * 获取 目标对象 
     * @param proxy 代理对象 
     * @return  
     * @throws Exception 
     */  
    /*public static Object getTarget(Object proxy) throws Exception {
          
        if(!AopUtils.isAopProxy(proxy)) {
            return proxy;//不是代理对象  
        }  
          
        if(AopUtils.isJdkDynamicProxy(proxy)) {  
            return getJdkDynamicProxyTargetObject(proxy);  
        } else { //cglib  
            return getCglibProxyTargetObject(proxy);  
        }
    }*/

    public static Object getTarget(Object proxy) throws Exception {
        Field field = proxy.getClass().getSuperclass().getDeclaredField("h");
        field.setAccessible(true);
        //获取指定对象中此字段的值
        Object personProxy = field.get(proxy); //获取Proxy对象中的此字段的值
        Field person = personProxy.getClass().getDeclaredField("target");
        person.setAccessible(true);
        return person.get(personProxy);
    }

  
    private static Object getCglibProxyTargetObject(Object proxy) throws Exception {  
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
        h.setAccessible(true);  
        Object dynamicAdvisedInterceptor = h.get(proxy);  
          
        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");  
        advised.setAccessible(true);  
          
        Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();
          
        return target;  
    }  
  
  
    private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {  
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");  
        h.setAccessible(true);  
        AopProxy aopProxy = (AopProxy) h.get(proxy);
          
        Field advised = aopProxy.getClass().getDeclaredField("advised");  
        advised.setAccessible(true);  
          
        Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();  
          
        return target;  
    }  
      
}